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Iowa/Major roads/Main

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===== County Roads In Iowa =====
[[File:Iowa CR Map.gif|500px600px|thumbnailFrameless|left]]
Iowa adopted its present county road numbering system in the late 1960's, featuring alphanumeric route numbers on the blue pentagon signs that are also used in many other states. Before that, county roads were given single-letter or double-letter designations, much like Wisconsin's county trunk roads and Missouri's state supplementary roads.